Machine-tool



J. LOOSE.

MACHINE TOOL.

APPLICATION man SEPT. 11, 1917.

1,3%8,502. e ted A g- 3, 1920..

wires o erates rafter Z,TQFFI?CE- JOI-IANNES LOOSEYOF icnivnsrerr-srurreanr, ennivrrinnnssrenon 'ro FORTUNA; WERKE, SPECIALMASCHEJENFABRIK, e. M. Bra-1., or GANNSTATT-STUTTGART,

GERMANY.

MACHINE-TOOL.

Specification of Letterslatent. Patented Augg, 1920,

; lkpplicationfiled September i1, 191 7; SeriaLNo,15910364, I

T0 aZZ'w/ wmit may concern Bq it known that I, JOHANNES Loosinof 3l harlstrasse, Cannstatt-Stuttgart, in the Kingdom of WVurttemberg, German'Empire,

civil engineer, have invented certain new and useful Improvements in Machine-Tools, of which the following is a specification.

Myinvention relates tomachine tools and more especially-to the means for controlling the feed of the tool into and out of operative position, and its particular object, is a mechanism ofthis kind which allows of throwing the tool, such as for instance the grinding wheel of a grinding machine provided with areciprocating tabla into operative position a short time before the table movement is being reversed, the movement of the feed gear being the same for each end position of the table, and therefor the tool being fed also the same tance.

A further object of my invention is the means for varying the tool feed at both end positions of the table either by an equal amount or by different amounts, there being also a chance left of'stopping the tool feed in one end position.

In the drawings afiixed to this specifica-.

tion and forming part thereof the preferred form of my invention is shown as applied to a grinding machine provided with a re-- ciprocating table, Figure 1 being a front elevation and Fig. 2 avertical section, on the line AB, of the tool feed controlling mechanism. Fig. 3 is a detail view of the reversing lever and pinion.

a is the reciprocating machine table, Z2 is one of two adjustable stops arranged on said table and designed, on being carried against the reversing lever c, to effect the reversal of the table movement. Doublearmed lever 0 ispivoted to the machine bed at s and its lower arm is provided at its free end with a toothed segment d in gear with a toothed wheel 6 rotatably located on a pin 9 and carrying a double-armed lever 7. A connecting rod 72, embracing the pin 9 carries a cross-arm 70. Setting screws 2',

i provided with heads Z, Z, and passingg a block, 22 is, inserted; spiral spring n inserted the connectingrod 71; and resting "againsta bolt 0 tends to pressf s'aid bolt against the block 6, A setting screw fm passing throughthe free end of rod hrests against theiopposite endfoffthe block 25;

-The operation of thisfdevice the followlngzfgtop b fastenedjto the reciprocat- 'ing table in meeting lever 0 causes it to move to the left,'the toothed segment d and toothed wheel eat the same time turning lever f to the right. Lever f in pressing its lower arm against s'cr'ewipulls rod h toward the left, thereby causing lever ;19 to o be turned to the left also and ratchet wheel r to be rotated about a certain'angle so as to feed the grinding wheel. The grinding wheel and the connection of feed wheel 0 thereto are not shown, but are well known and any approved form may be used, for example, that shown in the U. S. Patent of WVilcoX, et aL, No. 1,197 ,7 00. As soon as the reversing lever 0 has returned to its initial position, spring it forces rod k and lever p back into their original positions. Now the other stop I) (not shown) in meeting lever 0 will move it the other way, thus causing lever f to be pressed against screw h and lever p whereby another feed movement is imparted to ratchet wheel r and to the tool.

By unscrewing either one or the other screw 2', i the lever f is free to move in the direction of the screw in question and in consequence thereof the tool will be fed only at each second reversal of the table. By screwing screw m farther toward block 25 rod 72 can be prevented from returning to its original position; the farther screw m is screwed in, the shorter is the distance through which red It is free to move, and the movement of lever 39 as well as the feed distance of the tool is diminished accordingly. At the same time the arms of lever f will meet screws i and 2' respectively at a later moment, and in consequence thereof the tool feed will be retarded correspondingly, the moment of starting the tool feed more and more approaching the moment when the table movement is reversed, provided that the feed distance be diminished by screwing screw m farther toward the block 6.

Having thus described the preferred form rectilinear motion, two stops on said con nectingrod, a double-armed leverla'dapted to cooperate Witheither one orpthe other of said stops to giverectilinear motion to said rod and means influenced by the. stops on 'saidt'able for reversing saidilever. .2. In a machine: tool in combination, a reciprocating table, two stops onl said table,

a tool'feed ratchet gear anda connecting rod-of variable length connected, to it, two stops on said connecting rod, a doubleanmedlever adapted tocoeperate with either one orthe other of said stops and means influencedzby the stops on said table; for reversing said lever.

In a machine tool in combination, a reciprocatingtable, two stops on said table, a too'l'feed ratchet gear and a connecting a rod connected" to it, aelasti'cjsmeans for varying the length .ofrsaidaconnectingrrod, two stops on said connecting rod,-..aildoublearmed lever adapted to cooperate with either one or the other of said stops and means influenced by the stops on-sai d table for reversing said lever.

4. In a machine tool in combination, a

reciprocating table, two stops on said table, a tool feed ratchet gear and-a connecting rodconnected toiit 'havinga substantially rectilinear motion and having a bifurcated endftwdstops on saidconnectingrod, a

double-armed ""lever adapted .to cooperate with either one or the' other of said: stops having 'itsfpivotal axis embracedlby the bifurcated end of the connecting rod, a

reversing lever adapted. to be. influenced by the stops on said table, a toothed segment on'said reversing-leverand a toothed wheel connected to said double-armed leveriandin gear with said toothed segment.

In testimony whereofI afliX'my signature. 'JOHANNES LOOSE. 

